The Southeast Supply Header, LLC (SESH) is a joint venture between subsidiaries of CenterPoint Energy and Spectra Energy. The 270 mile, 36-inch and 42-inch diameter pipeline will extend from the Perryville Hub in northeastern Louisiana to the Gulfstream Natural Gas System, L.L.C. pipeline system, which is 50 percent owned by an affiliate of Spectra Energy, near southern Mobile County, Alabama. Southern Natural Gas, an affiliate of El Paso Corporation, and SESH will jointly own the first 115 miles of the pipeline.